Combined extractor and telescope cam plate



Oct. 30, 1956 l ELWHITTEMORE ET AL 2,763,461

COMBINED EXTRACTOR AND TELESCOPE CAM PLATE Fi led Aug\ 5, 1953 3 Sheets-Sheet l F/GE/ ham HTTOIF/Vf y L. E. WHITTEMORE ET AL 2,768,461

COMBINED EXTRACTOR AND TELESCOPE CAM PLATE Oct. 30, 1956 5 shets-rsheet 2 Filed Aug. 5, 1953 MGR Oct. 30, 1956 E. WHITTEMORE ET AL 2,768,461

' COMBINED EXTRAC'IOR AND TELESCOPE CAM PLATE Filed Aug. 5, ,1953 3 Sheets-Sheet 3 l an:

III/111111251277! 4 F762 I qmmuu' /2 20 COMBINED EXTRACTOR AND TELESCOPE CAM PL'ATE Leslie E. Whittemore and Russell M. Smith, Dorchester, Mass.

Application August 5, 1953, Serial No. 372,572

3 Claims. (Cl. 42-25) This invention relates to breech-loading top-ejecting firearms and is in the nature of an improvement on the firearm shown in U. S. Patent #2,479,886 dated August 23, 1949.

The firearm illustrated in said patent is provided with a telescope sight which is pivoted at its front end to the barrel to swing laterally between an. operative position in which its rear end is directly over the ejection opening and an inoperative position in which the rear end of the telescope sight is located at one side of the ejection opening, thereby to permit the emptyshell to be ejected when the bolt is withdrawn.

In said patent the swinging movement of the telescope sight is controlled by a cam carried by a cam plate that is secured to the bolt, the cam being so designed that when the bolt is in its forward closed position the telescope sight will be held in its. operative position, while when the bolt is retracted the telescope sight will be swung into its inoperative position and held therein until the bolt is again moved forwardly.

In the device of said patent the cam plate is secured to the bolt by screws which necessitates the drilling and tapping of the screw holes in the bolt. Inasmuch as the bolt has a rounded top surface, the operation of accurately drilling the screw holes in the bolt is one which requires a high degree of skill and which can not be satisfactorily performed by an ordinary machinist. Moreover the presence of the screw holes in the bolt is apt to weaken it, which is an undesirable feature.

It is an object of the present invention to provide a novel construction by which the cam plate can be secured to the bolt with precise accuracy by the means which is ordinarily employed for attaching the extractor finger to the bolt, thus making it possible for anyone to equip the firearm with the telescope sight and the cam plate for actuating the same.

The present invention, therefore, makes it possible to attach the cam plate to the bolt without making any change whatever in the bolt.

In the drawings:

Fig. 1 is a plan view of a portion of a firearm embodying the invention;

Fig. 2 is a side view of Fig. 1;

Fig. 3 is a view similar to Fig. 1 but showing the telescope sight in its inoperative position;

Fig. 4 is a side view of Fig. 3;

Fig. 5 is a fragmentary view partly in section showing the cam guiding portion of the supporting member;

Fig. 6 is a plan view of the combined cam plate and extractor finger;

Fig. 7 is a side view showing the cam plate mounted on the bolt, a portion of the bolt being broken away;

Fig. 8 is an enlarged sectional view on the line 8-8, Fig. 6; and

Fig. 9 is an enlarged underside view of the combined cam plate and extractor finger.

The firearm herein shown is indicated at 1 and comprises the usual barrel 2 and receiver 3 having an open nited States Patent 0 F 2,768,461 Patented Oct. 30, 1956 topped ejection opening for the ejection of the empty shells, and the bolt 4, these parts being such as are usually found in similar firearms.

The firearm is also shown as equipped with a telescope sight 5 which is pivoted at its front end to the barrel as shown at 6 to permit the telescope sight to swing laterally between an operative position in which the rear end thereof is directly over the ejection opening, as shown in Fig. 1, and an inoperative position in which the rear end of the telescope sight is situated at one side of said opening.

The telescope sight is shown as having a supporting member 7 secured to its rear end which rests on a guiding member 8 that extends transversely across the receiver and is secured thereto by suitable screws 39. The

I supporting member 7 has the downwardly directed poras similar parts found in the said Patent #2,479,886.

A feature of the present invention is a construction by means of which the cam plate 12 can be secured to the bolt 4 by the means usually employed for securing the extractor finger to the bolt, and by which the cam plate and the extractor finger are made as a single unitary element. The cam plate 12 has the concavely curved underface 15 to fit the convex curvature of the upper portion of the bolt 4, and said cam plate is formed on its under side with a longitudinally extending rib 16 of a a size to fit the'groove 17 in the bolt in which the extractor finger is usually mounted. The groove 17 is formed with a deepened portion 18 and the rib 16 on the cam plate is formed with a wider portion 19 having an increased vertical dimension which fits the deeper portion 18 of the groove. The cam plate is removably held in position by means of a pin 20 which extends across the deeper portion 18 of the groove and through the thicker portion 19 of the rib 16, said pin occupying an aperture which extends transversely across the upper portion of the bolt 4 on which the cam plate is mounted. The groove 17 and' the pin 20 are the means normally provided for securing the extractor pin to the bolt.

In the present invention the extractor pin, which is shown at 21, is made integral with the cam plate 12., the rib 16 being extended beyond the end of the cam plate to constitute said extractor pin and having the hook 22 at its end to engage the rim of the cartridge case and thereby extract it when the bolt is withdrawn. When, therefore, the cam plate is properly mounted on the bolt the extractor pin will be in proper position for extracting the empty shell upon the backward movement of the bolt.

The mounting of the cam plate on the bolt involves merely removing the pin 20 and the extractor occupying the groove 17' in the bolt, and then assembling the combined cam plate and extractor and the bolt with the rib 16 of said cam plate occupying said groove 17 in the bolt, and subsequently replacing the pin 20 as seen in Fig. 8.

With our invention, therefore, the cam plate can be attached to the bolt without making any change therein and simply by employing the means with which the firearm'is provided for securing the extractor pin to the bolt.

We claim:

1. In a breech-loading top ejecting firearm having a receiver provided with an upwardly directed ejection opening from which empty shells are ejected, a telescope sight pivotally mounted on the barrel to swing horizontally between an operative position directly over the ejection opening and an inoperative position on one side of said opening, and a reciprocating bolt, the combination with said receiver, telescope sight and bolt, of a cam plate mounted on the bolt, said bolt having in its upper side a longitudinally extending groove and the cam plate having on its under side a rib which is received in said groove, an anchor pin carried by the bolt and extending transversely across said slot and through the rib of the cam plate, thereby removably securing said plate to the bolt, said cam plate having cam means cooperating with the telescope sight to give the latter its swinging movement as the bolt reciprocates, and also having integral therewith a forwardly projecting finger which extends beyond the front end thereof and constitutes an extractor element for extracting empty shells during the backward movement of the bolt.

2. In a breech-loading top ejecting firearm having a receiver provided with an upwardly directed ejection opening from which empty shells are ejected, a telescope sight pivotally mounted on the barrel to swing horizontally between an operative position directly over the ejection opening and an inoperative position on one side of said opening, and a reciprocating bolt, the combination with said receiver, telescope sight and bolt, of an integral one-piece combined cam plate and extractor mounted on the bolt, the latter having a longitudinally extending groove in its upper face and the combined cam plate and extractor having a depending rib on its under face which is received in said groove, an anchor pin removably carried by the bolt and extending transversely across said slot and through said rib, thereby removably securing said combined cam plate and extractor to the bolt, said combined cam plate and extractor having cam means coop erating with the telescope sight to give the latter its swinging movement as the bolt reciprocates, and also having a forwardly projecting extractor finger which is in alinement with said rib and is adapted to engage the rim of a cartridge shell during the forward movement of the bolt and to extract said shell from the barrel during the backward movement of the bolt.

3. In a breech-loading top ejecting firearm having a receiver provided with an upwardly directed ejection opening from which empty shells are ejected, a telescope sight pivotally mounted on the barrel to swing hon'zontally between an operative position directly over the ejection opening and an inoperative position on one side of said opening, and a reciprocating bolt, the combination with said receiver, telescope sight and bolt, of a cam plate mounted on the bolt, said bolt having in its upper side a longitudinally extending groove and the cam plate having on its under side a rib which is received in said groove, an anchor pin carried by the bolt and extending transversely across said slot and through the rib of the cam plate, thereby removably securing said plate to the bolt, said cam plate having cam means cooperating with the telescope sight to give the latter its swinging movement as the bolt reciprocates, and said rib being extended forwardly beyond the front end of the cam plate to provide an extractor element for extracting empty shells during the backward movement of the bolt.

Whittemore Aug. 23, 1949 Benson Oct. 11, 1949 

